ftp.nice.ch/pub/next/developer/hardware/powerglove/PowerGloveInspector.NIHS.bs.tar.gz#/PowerGloveInspector/Source/PowerGloveView.m

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#import "PowerGloveView.h"
#import <math.h>

@implementation PowerGloveView

/* Over-ridden methods */
- initFrame:(const NXRect *)frameRect
{
    [super initFrame:frameRect];
    [self setDrawSize:256.0 :256.0];
    [self setDrawOrigin:-128.0 :-128.0];
    [self setOpaque:YES];

    return self;
}
    
- drawSelf:(const NXRect *)rects :(int)rectCount
{
    /* Get position and rotation of glove */
    float x     = [xField floatValue];
    float y     = [yField floatValue];
    float z     = [zField floatValue];
    float angle = [rollField floatValue];
        
    /* Erase previous view */
    PSsetlinewidth(0.15);
    PSsetgray(NX_WHITE);
    NXRectFill(&bounds);

    /* Draw empty half-circle */
    PSmoveto(x,y);
    PSarc(x,y,fabs(z),-angle,180.0-angle);
    PSsetgray(NX_BLACK);
    PSstroke();
    
    /* Draw filled half-circle */
    PSarc(x,y,fabs(z),180.0-angle,-angle);
    if (z<0.0) PSsetgray(NX_LTGRAY);
    PSfill();

    /* Draw cross-hairs and frame */    
    PSsetgray(NX_BLACK);
    PSmoveto(-128.0,0.0);
    PSlineto(128.0,0.0);
    PSmoveto(0.0,-128.0);
    PSlineto(0.0,128.0);
    PSstroke();
    NXFrameRect(&bounds);
    
    [window flushWindow];
    return self;
}

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.